Dropshafts with air circulation using an airshaft and horizontal air circulation pipes have been implemented for reducing downstream sewer air pressure and preventing sewer odor emission. There is a need to optimize the design for improved effectiveness and cost-saving. A one-week field monitoring program on a dropshaft with air circulation pipes was conducted in Edmonton, Canada, in order to validate the air flow model and assess the performance of the dropshaft with different air circulation pipe configurations. The air flow model was based on the upstream/downstream conditions of the dropshaft which were obtained from the field monitoring program. This study showed that the horizontal air circulation pipes on the top positions were more efficient in re-circulating air and depressurizing the downstream than the bottom ones, and increasing the size of the top horizontal air circulation pipes could significantly improve their effectiveness. This study provides guidance for designing or retrofitting dropshafts with air circulation pipes.

为了降低下游下水道的气压并防止下水道的气味散发，已经采用了使用空气轴和水平空气循环管进行空气循环的落井轴。需要优化设计以提高效率和节省成本。在加拿大埃德蒙顿进行了一个为期一周的带有空气循环管的吊轴现场监测程序，以验证空气流量模型并评估具有不同空气循环管配置的吊轴的性能。气流模型是基于从现场监控程序获得的吊轴的上游/下游条件。这项研究表明，顶部的水平空气循环管比底部的空气循环管更能有效地再循环空气并降低下游的压力，增加顶部水平空气流通管的尺寸可以显着提高其效率。这项研究为使用空气循环管设计或改造吊轴提供了指导。